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Writing output from a void method to a file

public void displayResults()
{
System.out.println("The loan amount is $" + loanAmt);
System.out.println("The number of payments per year is " + pmtsPerYear);
System.out.println("The number of years is " + numYears);
System.out.println("The interest rate is " + annIntRate + "%");
System.out.println("The amount of the loan payments will be $" + this.getPmtAmt() + ".");
}

The second class called AmortizationClient has my main method.

PROBLEM:
I'm trying to figure out how to get the output from the void method to write to a newly created file. I know how to use an object to invoke this void method....what I don't know is how to do it when using the PrintWriter Class. This is all being done within a switch statement.